Pipe-wrench



UNITED STATES PATENT OFFICE.

JOSEPH BROWNING, OF PHILADELPHIA, PENNSYLVANIA.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 594,775, dated November30, 1897.

Application filed January 11, 1897. Serial No. 618,690. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH BROWNING, of the city and county ofPhiladelphia and State of Pennsylvania, have invented an Improvement inPipe-Wrenches, of. which the following is specification.

My invention relates to pipe-wrenches; and

it consists of the improvements which are set forth in the followingspecification and shown in the accompanying drawings.

My invention relates to that class of pipewrenches which employ amovable grippingwheel which acts upon the pipe with a gripping action,and my improvements relate particularly to the construction of thegripping wheel,whereby its gripping action is increased and the tendencyto cause the pipe to travel or move longitudinally is avoided.

My improvements are more particularly described in connection with theaccompanying drawings.

In the drawings, Figure 1 is a front view of a pipe-wrench embodying myinvention. Fig. 2 is a side-view of the same with part of the handlebroken away. Fig. 3 is a sectional View on the line 00 a; of Fig. 2.

A is the body of the wrench, having the usual gripping -jaw a at thefront and the handle B.

C is a movable carriage embracing the body Aand movable thereon. Aspring D, acting on the carriage O, presses it forward. I have shown thecarriage provided with an angular extension 0, projecting rearwardlyinto a longitudinal recess bin the handle and guided upon a longitudinalrod E, arranged in the recess. The spring D is shown encircling the rodE and bearing against the angular extension 0.

J ournaled in arms f of the carriage O is the gripping-wheel F, betweenwhich and the jaw a the pipe is gripped. The body Ais recessedlongitudinally, as at d, to receive the wheel F. Carried by the wheel Fare pinions I, engaging racks J J on the body A and traveling thereon.

So far as the wrench has been described the particular features ofconstruction are not material to my invention, which relatesparticularly to the construction of the gripping-wheel F. It is usual toroughen or knurl the periphery of the gripping-wheel, so that it willproperly grip the pipe. An effective gripping action is not obtainedwhen the periphery of the wheel is roughened by straight transversegrooves, because the line of contact is alternately on the point of astraight transverse rib and on the groove between two ribs, so that theaction is not uniform. When the periphery is grooved diagonally, theline of contact is always upon the points of the ribs, but the diagonalarrangement of the grooves tends to impart to the pipe a longitudinalmovement. To avoid these defects, I provide the periphery of the wheelwith V- shaped grooves, so that the tendency of one set of diagonal ribsto move the pipe in one direction counteracts that of the other set andat the same time the line of gripping action is always upon the pointsof the ribs.

In my preferred construction I form the wheel F in two parts or disks GG, provided with oppositely-disposed diagonal grooves, which when thetwo disks are placed together form a series of V-shaped grooves. Thesedisks are shown so arranged that the points of the V-shaped grooves'aredirected on the upper side of the wheel away from the gripping-jaw a. Ihave shown the disks G Geach integral with its corresponding pinion Iand carried on a pin H in the arms f f.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is as follows:

A pipe-wrench having a movable grippingwheel composed of parts havingtheir peripheries provided with oppositely-directed diagonal grooves.

In testimony of which invention I have hereunto set my hand.

JOSEPH BROWVNING. Witnesses: J W. KENWORTHY, ERNEST HOWARD HUNTER.

